Polychrome Imitation Stone Paint (Water-in-Sand & Water-in-Water) Construction Specifications

For water-in-sand and water-in-water polychrome imitation stone paint to achieve high simulation effects, stable finished paint is required. The color particles must be transparent, textured, and properly proportioned to match the stone color. The spray operator must be highly skilled; before on-wall spraying, a test sample shall be sprayed by the operator and must be consistent with the factory standard sample before formal construction. The realistic stone imitation effect of water-in-sand polychrome paint is jointly achieved by factory-formulated colored coatings and professional spray operators.

1. Divided Grid Shapes

To avoid a rigid appearance on the exterior wall, square grids should be avoided as much as possible during water-in-sand construction. Horizontal rectangles, vertical rectangles, and staggered (I-shaped) layouts are excellent alternatives. The building’s function shall also be considered: stable grid designs are recommended for office buildings of commercial and institutional entities, while more lively grid schemes can be adopted for residential buildings, shopping malls, schools, gymnasiums, etc.

2. Grid Placement for Water-in-Sand

To make the sprayed water-in-sand effect closer to natural stone, the same grid layout as stone cladding can be used in principle, such as grids at internal/external corners, window frames, and building edges. However, considering the limitations of natural stone, water-in-sand grids do not need to be set at internal/external corners. Grids around window frames are recommended, and small fragments or narrow edges should be avoided as much as possible.

3. Grid Size for Water-in-Sand

Grid sizes shall be reasonably divided according to the building height:

High-rise buildings: 1.5–2 ㎡ per grid
Mid-rise buildings: 1–1.5 ㎡ per grid
Low-rise buildings: within 1 ㎡ per grid

4. Width of Construction Joints for Water-in-Sand

Joint widths shall be designed rationally based on grid area, generally ranging from 0.8–1.5 cm. Effects such as wide horizontal/narrow vertical or narrow horizontal/wide vertical joints can also be applied, but the width shall be controlled within 2 cm as much as possible.

5. Color of Construction Joints for Water-in-Sand

This detail is often overlooked but significantly impacts the overall effect of water-in-sand. The core design principle is to create a color contrast between the water-in-sand coating and the joint lines.

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